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What are COOGAR™ 5 and COOGAR™ 20?

Coogar 5 and Coogar 20 are high quality active shielding gas mixtures for the MAG welding of plain carbon and alloyed steels.

The benefits of Coogar

Coogar mixtures offer the following benefits over CO2:

Increased welding speed.
Improved bead profiles, resulting in less wire being used.
Reduced spatter levels.
Less particulate fume is produced.
Enhanced fusion profiles.
Higher strength welds, due to lower element loss.

Which Coogar?

Coogar 5—suitable for MAG welding applications on thin sheet and plate up to 10mm.
Coogar 20—suitable for MAG welding applications on thicker section material. Coogar 20 has excellent positional capability.

The technology of MAG welding with Coogar

The effect of shielding gas composition on metal transfer mode in spray MAG welding.

The effect of shielding gas composition on weld profile/bead shape.

When CO2 is used as the shielding gas, the violent arc action it produces results in a good deal of spatter and an untidy bead. Very accurate control of welding conditions is necessary to produce a satisfactory result. In contrast, Coogar mixtures produce a smoother, more stable arc resulting in little or no spatter and an excellent bead appearance. Furthermore, these results can be achieved consistently even when the welding conditions have not been optimised.

The relatively high percentage of argon in Coogar mixtures permits easy arc starting because of the low ionisation potential of the gas. In addition the relatively high density of Coogar mixtures promotes an effective shield at moderate gas flows.

Unlike CO2, Coogar mixtures give a smooth axial spray type of metal transfer which significantly reduces spatter.

The controlled additions of CO2 and O2 to Coogar mixtures are used to improve the performance characteristics of the shielding medium.

The CO2 component dissociates partly in the arc producing additional heat and allowing a better penetration than could be obtained with pure argon.

The small percentage of O2 in Coogar , provides a more stable arc and increases the wettability of the weld pool.

The additions of CO2 and O2 are balanced to provide optimum mixtures for quality MAG welding in all material thicknesses.

Analysis

Coogar 5: 93% Ar, 5% CO2, 2% O2 (EN439 : M14).
Coogar 20: 78% Ar, 20% CO2, 2% O2 (EN439 : M24).

Parameter guide for Coogar 5 and 20

Dip transfer

material thickness (mm) shielding gas wire dia.(mm) low rate (1/min) amps volts

1.6
3.2
6
9 Coogar 5
Coogar 5
Coogar 5
Coogar 20 0.8
1.0
1.0
1.2 9-12
9-12
9-12
12-14 90-110
120-150
130-160
150-180 17-19
18-22
19-22
20-23

Spray transfer

material thickness (mm) shielding gas wire dia.(mm) low rate (1/min) amps volts

9
12 Coogar 20
Coogar 20 1.2
1.6 14-17
17-19 240-260
250-280 25-27
26-29

This parameter table is to be used as a guide, parameters will depend upon joint type, wire position etc.

What are COOGAR 5 and COOGAR 20? is available in the Portable Document Format (.pdf). To view a .pdf file, you will need a free copy of the Acrobat Reader.

What are COOGAR 5 and COOGAR 20?

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